Friend of a friend (FOAF) is a phrase used to refer to someone that one does not know well, literally, a friend of a friend.

In some social sciences, the phrase is used as a half-joking shorthand for the fact that much of the information on which people act comes from distant sources (as in "It happened to a friend of a friend of mine") and cannot be confirmed. It is probably best known from urban legend studies, where it was popularized by Jan Harold Brunvand.

The term was apparently first published by Rodney Dale in his 1978 book The Tumour in the Whale, in which he discussed the "FOAFtale".

The rise of social network services has led to increased use of this term.

Samuel Timothy "Tim" McGraw (born May 1, 1967) is an American country singer and actor. Many of McGraw's albums and singles have topped the country music charts with total album sales in excess of 40 million units in the US, making him the eighth best-selling artist, and the third best-selling country singer, in the Soundscan era. He is married to country singer Faith Hill and is the son of former baseball player Tug McGraw.

McGraw had 11 consecutive albums debut at Number One on the Billboard albums charts. Twenty-one singles hit No. 1 on the Billboard Hot Country Songs chart. He has won 3 Grammys, 14 Academy of Country Music awards, 11 Country Music Association (CMA) awards, 10 American Music Awards, and 3 People's Choice Awards. His Soul2Soul II Tour with Faith Hill is the highest grossing tour in country music history, and one of the top five among all genres of music.

McGraw has ventured into acting, with supporting roles in The Blind Side (with Sandra Bullock), Friday Night Lights, The Kingdom, and Four Christmases (with Vince Vaughn and Reese Witherspoon), and lead roles in Flicka (2006) and Country Strong (2010). He was a minority owner of the Arena Football League's Nashville Kats. Taylor Swift's debut single, "Tim McGraw", refers to him and his song, "Can't Tell Me Nothin'".

Demetria Devonne "Demi" Lovato (born August 20, 1992) is an American singer-songwriter, musician, and actress. Her earliest roles included Angela on Barney & Friends, before she became better known for her starring roles in the Camp Rock movies, as Sonny Munroe in the Disney sitcom Sonny with a Chance, and as the star of the 2009 movie Princess Protection Program. She is also involved in philanthropic activities through charity work and various social and environmental causes.

As a solo musical artist, Lovato released her debut album Don't Forget on September 23, 2008. The album debuted at number two on the Billboard 200 selling 89,000 copies in the first week. It has since shipped over 500,000 copies, earning a gold certification in the United States. Lovato released her second album, Here We Go Again, on July 21, 2009. The album debuted at number one on the Billboard 200, selling 108,000 copies in the first week. Her third studio album, Unbroken, was released on September 20, 2011 and peaked at number four on the Billboard 200. She is working on her fourth studio album.